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finally I've installed fabrik from the web tab installation of joomla.
I'm starting to create my first form and I've to say is almost easy....
I've tried by download it from Fabrik website.
I'll try tomorrow by joomla web tab installer.
I've just downloaded the last version of Fabrik for Joomla! 3.9.x and tried to install it like a component.
The file pkg is uploaded but...